G.f.: A(x) = Sum_{n>=0} x^(n*(n+1)/2) / Product_{k=1..n} (1-x^k)^k.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =4a(6) =5a(7) =8a(8) =10a(9) =17a(10) =21a(11) =32a(12) =44a(13) =62a(14) =86a(15) =122a(16) =164a(17) =230a(18) =318a(19) =428a(20) =591a(21) =803a(22) =1088a(23) =1467a(24) =1995a(25) =2665a(26) =3596a(27) =4800a(28) =6430a(29) =8552